Egr cooler leaking externally?

[Nilao]

Update, replaced all the seals along with a new egr cooler and it's still leaking from the same spot. I pulled the bolt out of the cooler to see if it was leaking from behind it and it was dry. Now I have to pull the oil cooler to see if that gasket shows signs of leaks as that is the only other place it can possibly be coming from in that location. Anything I should watch for in the removal of the oil cooler?